Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaa83a2cecada3f…

MALICIOUS

PDF

109.9 KB Created: 2021-01-07 02:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2b70e55a450701ffbb7611cb03ed4c79 SHA-1: c11ce2eaea5a46efd1893088bb966b5f1c15acee SHA-256: 4eaa83a2cecada3f36e8c1beae08c630a8fa8400b66631b04e0c7a84e6aa493f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with several pointing to disposable hosting services and potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host a collection of links, likely to lure users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=pokemon+ash+gray+guide+pdf PDF link annotation
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/givovomuladuna-rizake-mewodolakor.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/0d4e8c49a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5fbf329d9e6bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_5fad9ee284d36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcceb7876a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fadff2e658f5.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/3e9e3174cfad9c3.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/gogatasunoxiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382196/normal_5ff559ca1b565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4273f8-8713-4408-a156-e9ba0f3d2202/38685750209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc6f05c-39b3-4948-aad5-ba307d499c93/digital_lighting_and_rendering_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430f91a4-b7b3-4469-a671-84f52d5518ad/orgb_4_download.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/67403440077.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001701b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701B 5588 bytes
SHA-256: 9d1c9fad163011ca2865672076ea1b649bb213f3326c60b8b03388111ce3d110
font_01_sfnt_off00018302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18302 11292 bytes
SHA-256: aee89f7d70df75f899b1c1e1f9107910cbd5e7db0755f1757805d1af72b34b2e

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